PRACTICE 553-2201-182
Table 1-F
INPUT IMPEDANCE
CONNECTION FROM
REFERENCE
FREQUENCY
4W TRUNK TO PORT IMPEDANCE RANGE
Line 600
R
200-500 Hz
500-3400 Hz
Trunk 600
R
200-500
Hz
500-1000 Hz
1000-3400
Hz
Note 1: This parameter is for
EIA-compatible
trunks only.
Note 2: A reference impedance of 600
R
resistive is used.
MINIMUM
RETURN LOSS
20
dB
26
dB
20 dB
26
dB
30
dB
Table 1-G
IDLE CHANNEL NOISE
CONNECTION
TYPE C-MESSAGE
WEIGHTED
(d8rnC)
3
kHz
FLAT
(d8rn)
Line-Line
Line-Trunk
Trunk-Trunk
<20 <29
<20
at line
<29
at line
<23
at trunk
<29
at trunk __
<20 <29
Table 1-H
LONGITUDINAL BALANCE
FREQUENCY
(Hz)
200
500
1000
3000
MINIMUM
BALANCE
(d8)
:i
AVERAGE
BALANCE
(d8)
:z
63
58
Note:
Measured according to IEEE Standard 455-1983.
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